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zooqueenandHanzo Dev
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POST /v1/billing/subscribe/card takes an optional coupon code. The coupon is a models/coupon row (Filter "plan", Type percent) in the reserved platform namespace "admin", beside the platform promo. It must be enabled, inside [StartDate, EndDate], under Limit and cover the plan; an org and a card each redeem a code once (models/couponredemption rows), and the use is reserved under the code's lock before the card is charged and given back on a decline. Any refusal is a 400 or 409 before the card is touched. The percent comes off the first charge only, through engine.Discounted, the same arithmetic the first invoice uses, so charge == AmountDue. The first invoice names the coupon; the subscription never carries it, so renewals bill the catalog price (less only a promo the row carries). GET /v1/billing/plans?coupon=CODE quotes couponCode, couponPercent, couponFirstCents and couponEnds on covered paid rows and couponError (unknown, expired, exhausted, not_applicable) on the rest. Without the parameter the response is unchanged. SuperAdmin: GET/PUT /v1/platform/coupons/:code (RequirePlatformAdmin), audited as coupon.created/coupon.updated billing events naming the actor. middleware.Actor is the one actor-naming rule, moved from billing's minter. Co-authored-by: Hanzo Dev <[email protected]>